Skiving machine



July 18, 1939. L J, BAZZQNI 2,155,280

SKIVING MACHINE Filed Dec. 50, 1937 3 Shes-Shee'l 1 70 7a 78 76 .68@ Tlgl.

i fla f T7 L UVW/M n' 6R fas E E y m 92 ql1ro@ I nf u, fum/Inf @J 5f y? 36 40 4 56 /A/Vf/VTUR July 18, 1939. BAZZQM 2,166,280

SKIVING MACHINE FiledfDec. 30, 1957 3 Sheets-Sheet 2 July 18, 1.939. L. J. BAzzom 2,166,280-

SKIVING MACHINE Filed Dec'. 50, 1957 s sheets-sheet 3 infr v Il dill /V VEN TUR Patented July 18, 1939 `UNI TED STATES PATENT OFFICE [SKIVING MACHINE Application December 30, 1937, Serial No. 182,546

3 Claims.

This invention relates to skiving machines and is illustrated as embodied in a machine for skiving the projecting margins of covers applied to i the rear and side faces of heels t'o'uniform widths.

It is an object of the present invention to provide an improved'machine o'f the general 'type disclosed in United States Letters Patent No. 2,029,304, granted February 4,1936, on an application iiled in.` my name. With the above object in view, and in accordance with a feature'of this invention, there is provided Aa vskiving machine comprising a cutter rotatable about an axis and `having a plurality of circumferentially spaced cutting edges a portion of` each of which is equidistant from said axis, and an anvil having a concave cylindricaliace which has an edge approximately engaged by the 'cylinder vof revolution of said portions of the cutting edges and which Aformsa tapered opening with said cylinder of revolution, said anvil being provided with another face which is substantially continuous with said cylindrical face and which extends away from thhe cutter and forms with the surface of revolution of other portionsof the cutting edges of the cutter a throat through which work such, for example,-as a projecting margin of a cover secured to aheel, may be fed into said tapered opening. The anvil maybe swung into different adjusted ypositions about an `axis which is substantially parallel to the axis of rotation'of the cutter and extends along said edge of the concave cylindrical face of the anvil, in o-rder to vary the width of the tapered opening in accordance with'the thickness ofthe cover margin. By providing the anvil ofthe above machine with a concave cylindrical face which is adjustable about said aXis it is possible quickly and effectively to skive projecting cover margins to a uniform width equal tothe length of said face, irrespective of `the thickness of the cover margin.

The variousfeatures ofthe invention will be understood and -appreciated .from the pfollowing detailed description read in connection with the accompanying drawings, in which Fig. 1 is` aside viewypartly kbroken away, of the illustrated machine;

Fig. 2 is a -plan view ofthe machine, partly in section, on line II-II of Fig. 1;

Figs. 3 and 4 Vare illustrative views showing the top and the forwardiprojecting margins of covers secured toheels in the process of being vskived by the above'machine;

Fig. `5is a perspective View of an anvil for @supporting the cover iina'r'gin;

Fig. 6 is an enlarged front view of the fanvil and a cooperating gage;

Fig. '7 is an enlarged side View showingin detail the construction of the anvil and the vcutting edges of the cutter; 5

Fig. Y8 is an enlarged section on line VIII-VIII of Fig. 1; and

Fig. 9 is a perspective View of a heel the skived projecting margins of the'cover of which have been secured to the attaching faceand thebreast` 10 of `the heel.

The illustrated machine is `described withreference to skivin'g the top and forward projecting margins 20 (Fig. 3), 22 (Fig. 4) of a leatherr cover 24 which is cementedor otherwise secured to the l l5 side and rear faces of Va Louis heel 26, preparatory to securing the respective margins toL the attaching face 28 and the breast 30 of theheel.

The projecting 'margin 20, 22 of the cover is supported by an anvil 32 as .the heel and Vthe20 projecting margin of its cover `are vguided byaV gage 34 and the anvil past a rotary cutter 38, the projecting margin being skived to a'uniform width by cutting edges 38` of the cutter.

The cutter is secured by a screw 40 (Figs. 1 and 2) to a drive shaft 42 (Fig. 2) and is provided with a plurality of skewed'blades 44 which'h'ave about 8 of front rake. Each cutting edge38 oi the cutter comprises a leading portion 48 (Figs. 7 and 8) which is curved toward the axis 50 (Figs. 2 and 8) of rotation ofthe cutterpand-a trailing portion 52 which is equidistant from said axis.

The cutter 36 is housed in a casing'54 (Figs. 1 and 2) which is securedby screws 56 to a bed plate 58 and is provided with an air duct'. The left end of the duct 60 is conne'ctedto a suitable source of suction to insure against leather dust and chips depositing upon the flesh side of the cover margin which is usually coated with cement. In order furtherto `insure against the depositing of leather dust on the flesh side of the cover margin there is provided a tube l'l'through which air is introduced into a gap 82 (Fig. 1) formed between the gage 34 and the 'anvill'32.

The gage 34is pivoted to a carrier`$4 (Fig. 1) which ts in an arcuate groove 66 formed in the casing 54 and has an elongatedfslot 68 for r receiving a screw 10 threaded into the casing. The carrier 64 is also provided with a'lug 'l2 into 50 which is threaded a screw 14 which passes through an opening in an extension 16 of the gage 34, the extension being forced against the head of the screw 14 by a spring '18. By moving `the carrier 64` into diierentfa'djustedpositions 55 along the arcuate groove 66 which is centered about the axis 50 of rotation of the cutter 36, and turning the screw '|4 to swing the ga-ge 34 With relation to the carrier 64, the lower end of the gage may be initially adjusted to its proper position with relation to the anvil 32.

The lower portion of the anvil 32 fits between bifurcations of a slide 80 which is movable into different adjusted positions along a guideway 82 of the bed plate 58. The lower end of the anvil 32 is provided with an arcuate slot 84 of suitable size to receive rolls 86 which engage the upper face of said slot and are mounted upon screws 88 threaded into the slide 80. A roll 90 mounted upon an eccentric portion of a screw 92 is forced against the lower face of the arcuate slot 84 by turning the screw which may be secured in different adjusted positions in the slide 80 by a nut (not shown). The anvil 32 may be adjusted into different angular positions with reference to the slide 80 by releasing the screws 88 and turning a thumb screw 94 against the end of which a depending lug 96 of the anvil is forced by a spring 98. After the above adjustment has been effected the screws 88 are again tightened causing the anvil 32 to be clamped to the slide 80. The slide 00 is moved into different adjusted positions along the guideway 82 by a thumb screw |00 which is pivoted to the bed plate 58 and is threaded into the slide. To insure against the turning of the adjusted screw |00 there is provided a binding spring |02. As will later appear, the arcuate slot 84 is centered about an axis |04 (Figs. 5 and 8) which is parallel to the axis 50 of rotation of the cutter and extends along the lower edge |00 (Fig. 5) of a concave cylindrical face |08 (Figs. 5, 7 and 8) of the anvil 32. When the anvil 32 is in its operative position the trailing portions 52 of the cutting edges just miss the edge |00 of the face |08 during the rotation of the cutter 36. In order to close up an opening |00 (Fig. 2) formed between the anvil 32 and the casing 54 the anvil has secured to it a curved plate I.

In skiving the top projecting margin 20 of the cover 24 (Fig. 3) it is desirable that the skiving cut extend to line ||0 (Figs. 3 and 9) which lies within the rim of the attaching face of the heel vthereby insuring that the skived portion of the margin shall not be visible in the finished shoe. In skiving the forward projecting margins of covers (Fig. 4),'however, it is desirable to have the skiving cut extend to the breast edge ||2 (Figs. 4 and 9) of the covered heel since it is difficult effectively to cement the heel-breast covering flap (not shown) to the grain surface of the cover margin.

In order to adjust the machine for skiving cover margins 20, 22 the operator turns the thumb screw |00 (Figs. 1 and 2) causing the anvil to approach the cutter until the lower edge |05 of its concave cylindrical face |08 is approximately engaged by the trailing portions of the cutting edges when the cutter is rotated. The anvil is then angularly adjusted with relation to the slide 80 after releasing screws 88 by turning the thumb scribed as tapering circumferentially of the cutter toward the edge |06 of the anvil 32. The gage 34 is then adjusted to its proper position with relation to the anvil 32 through the provision of the above-described mechanism, the position of said gage being varied in accordance with the shape of the heel and whether the top or the forward projecting margin of the cover is to be skived.

It is desirable that the skived margins be wide enough to insure that when they are laid upon the attaching and breast faces, respectively, of the heel no abrupt changes in the curvature of said faces shall appear. Skived portions of leather absorb glue or cement by which the heel is attached to the shoe upper and the fiap is attached to the breast of the heel, more readily than the grain surface of leather. It is therefore desirable, as above stated, in skiving the forward projecting margin 22, that the cuts extend to the breast edge of the heel since the lateral margins 0f the heel-breast covering ap of the finished shoe have a tendency to break away from the breast of the heel when they are secured to inturned grain surfaces of the cover margin. Care should be taken, however, as previously explained, to insure that in skiving the top projecting margin the skiving cuts shall not extend too close to the rim of the heel.

With the above considerations in view, the radius of curvature of the cylindrical concave face |08 of the anvil 32 is equal to or preferably slightly less than the radius I8 (Figs. 1 and 8) of the cutter 36. With such a construction it will be clear that the anvil 32 may be adjusted about said axis |04 (Figs. 5 and 8) into close proximity to the cylinder of revolution HS (Fig. '7) of the trailing portions 52 of the cutting edges of the cutter without interfering with said cutter, thereby insuring that very thin as well as thick covers may be skived to a uniform width approximately equal to the heightwise dimension of the face |08 of the anvil 32. By providing an anvil 32 having a concave cylindrical face |08 which approximates the path of movement of the trailing portion 52 of the cutting edge, it has been found that the projecting margin may be beveled to a predetermined width with minimum amount of drag on the cover. In order to insure that the edge of the skived projecting margin of the cover shall be feathered to a well-defined line the anvil is provided withl a narrow shoulder I2?I for supporting the cover margin extending below the edge |06.

rIhe anvil also comprises a sole-engaging face |24 (Figs. '7 and 8) which curves away from the cutter and forms with the surface of revolution of said portions 40 of the cutting edges, a throat |26 through which the projecting margin is fed into the tapered opening ||4. The face |24 is continuous with the concave cylindrical face |08, said faces 'constituting the work-supporting face of the anvil 32. The top edge |28 of the anvil 32, which serves as a gage and cooperates with the gage 34 in guiding the heel and the projecting margin of its cover past the cutter 36, is sharply curved, as best shown in Fig. 6, in order to accommodate the sharply curved breasts of Louis heels.

In order to skive the forwardly projecting margin 22 of the cover 24 the heel is positionedwith the lateral portion of its breast in engagement with the edge |28 (Figs. 5 and '7) of the anvil and with its side in engagement with the gage 34, the projecting margin being inserted in the gap 62 (Fig. 1) formed between the anvil 32 and the gage 34. The heel guidedr by the anvil 32 and the gage 34 is moved past the cutter, the projecting man gin being progressively bent toward the anvil by the leading portions 1B of the cutting edges of the cutter and then being forced against the concave cylindrical face of the anvil as it is skived to a predetermined width by the trailing portions 52 of the cutting edges. The cutting strokes of the cutting edges of the cutter progress toward the edge of the margin and tension the same as it is skived. In skiving the top projecting margin 2i] (Fig. 3) o-f the cover the gage 34 is adjusted to the position illustrated in Fig. 3 so that the sklving cut shall lie Within the rim of the attaching face ZB, for reasons above explained. The heel and the top projecting cover margin are then fed past the cutter in the manner above described to skive said margin.

Having described the invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A skiving machine having, in combination, a cutter rotatable about an axis, said cutter having a plurality of cutting edges portions of which are equidistant from said axis, means for rotating the cutter, and an anvil having a concave cylindrical face which has an edge approximately engaged by the cylinder of revolution of said portions of the cutting edges and which forms with said cylinder of revolution an opening tapering circumferentially of the cutter, said anvil having another face which is substantially continuous With said first-named face and extends away from the cutter and forms with the surface of revolution of other portions of said cutting edges of the cutter a throat through which Work to skived is fed into said tapered opening.

2. A skiving machine having, in combination, a rotary cutter having a plurality of cutting edges, means for rotating said cutter, an anvil having a face for supporting a margin of a nexible piece of material against the action of said cutter, a portion of said face having an edge which is approximately engaged by portions of said cutting edges during rotation of the cutter, said portion of the face being concave circumferentially of the cutter and forming a tapered opening with the surface of revolution of said portions of the cutting edges, another portion of said face forming with the surface of revolution of other portions of said cutting edges a throat through which said margin is fed into said tapered opening, and means for swinging said anvil into diierent adjusted positions about an axis which is substantially parallel to the axis of rotation of said cutter and extends along said edge of the concave cylindrical face of the anvil thereby to vary the width of the tapered opening in accordance with the thickness of the margin t be skived.

3. In a machine for skiving to a predetermined Width a projecting margin of a cover secured to a heel, a rotary cutter having a plurality of cutting edges, an anvil having a face for supporting said margin against the action of the cutter, said face comprising a concave cylindrical portion extending circumferentially of an adjacent portion of the surface of revolution of said cutting edges and having an edge approximately engaged by portions of said cutting edges, said cylindrical portion having a radius of curvature approximately equal to the radius of the cutter and forming with the surface of revolution of portions of saidv cutting edges an opening tapering circumferentially of the cutter, and other portions of said face of the anvil forming with the surface of revolution of other portions of said cutting edges a throat which tapers in the general direction of the axis of rotation of the cutter and through which the margin is fed into said tapered opening, and means comprising said anvil for guiding the heel and the projecting margin of its cover past the cutter.

LEWIS J. BAZZONI. 

